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The effect of tacticity on the conformational properties of poly(1-olefin sulfone)s

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Abstract

The effect of tacticity on the conformational properties of poly(olefin sulfone)s was studied. Tactic polymers, prepared from racemic thiirane monomers using chiral inititators were compared with atactic polymers prepared by free radical co-polymerisation of the 1-olefin with sulfur dioxide. Analysis of the XRD patterns showed that the tactic polymers formed more ordered structures in the bulk with longer layer spacings, consistent with a model in which their side chains meet at the tips in contrast with the atactic polymers whose side chains interdigitate. 13C MAS NMR experiments suggest that as tacticity increases so too does the proportion of C–S bonds in the gauche conformation, however the proportion of S–C bonds in the trans conformation falls, in contrast to a reported molecular mechanics study. Finally, DSC measurements on the polymers with longer side chains showed the presence of two endotherms on heating, illustrating definite liquid crystalline behaviour.

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Acknowledgements

The authors would like to thank the liquid crystal group at the Ministry of Defence (MOD) Malvern and the Department of Education for Northern Ireland (DENI) for funding. We also appreciate the input of Dr David Apperly (Durham University) for recording the MAS NMRs and Dr K Blackwood (MOD) for helpful discussions.

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  1. John F. Callan

    Present address: School of Pharmacy, The Robert Gordon University, Aberdeen, Scotland, AB10 1FR, UK

Authors and Affiliations

  1. School of Chemistry, Queen’s University of Belfast, Belfast, Northern Ireland, BT9 5AG, UK

    John F. Callan & Allan H. Fawcett

  2. School of Pharmacy, Queen’s University of Belfast, Belfast, Northern Ireland, BT9 5AG, UK

    Robert K. Malcolm

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  1. John F. Callan
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  2. Allan H. Fawcett
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  3. Robert K. Malcolm
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Correspondence to John F. Callan.

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Callan, J.F., Fawcett, A.H. & Malcolm, R.K. The effect of tacticity on the conformational properties of poly(1-olefin sulfone)s. J Polym Res 15, 107–113 (2008). https://doi.org/10.1007/s10965-007-9149-z

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  • DOI: https://doi.org/10.1007/s10965-007-9149-z

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